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                                在Object-C中的NSObject对象中

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@interface NSObject  {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wobjc-interface-ivars"
    Class isa  OBJC_ISA_AVAILABILITY;
#pragma clang diagnostic pop
}


上述表述Objective-C类是由Class类型来表示的，它实际上是一个指向objc_class结构体的指针

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